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                  <p class="p_Heading1"><span class="f_Heading1">Local Pre/Post Conditions</span></p>



  
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                <p class="p_BodyText"><span class="f_BodyText"><a href="action.htm">Actions</a> can be further defined with </span><span class="f_BodyText" style="font-style: italic;">pre-condition</span><span class="f_BodyText"> </span><span class="f_BodyText">and</span><span class="f_BodyText" style="font-style: italic;"> post-condition</span><span class="f_BodyText"> notes</span><span class="f_BodyText">, which constrain an Action's entry and exit. These notes can be added to an Action as defined below.</span></p>
<p class="p_TextIndentedL2"><img src="activity%20-%20actionprepost.png" width="382" height="327" border="0" alt="Activity - ActionPrePost"></p>
<p class="p_BodyText"><span class="f_BodyText">See </span><span class="f_BodyText" style="font-style: italic;">UML Superstructure Specification, v2.1.1, Figure 12.32, p. 316</span><span class="f_BodyText">.</span></p>
<p class="p_SubHeadingL1"><span class="f_SubHeadingL1">Create a Constraint</span></p>
<p class="p_BodyText"><span class="f_BodyText">To attach a constraint to an Action follow the steps below:</span></p>
<ol style="text-indent: 0px; margin-left: 48px; list-style-position: outside;">
<li value=1><span class="f_NumberedList">Right-click on the Action. The context menu displays:</span></li>
<li value=2><span class="f_NumberedList">Select the </span><span class="f_MenuKeyField">Add | Constraint</span><span class="f_NumberedList"> menu option. A </span><span class="f_NumberedList" style="font-style: italic;">Note</span><span class="f_NumberedList"> is created on the diagram, connected to the Action.</span></li>
<li value=3><span class="f_NumberedList">Right-click on the </span><span class="f_NumberedList" style="font-style: italic;">Note</span><span class="f_NumberedList">. The context menu displays.</span></li>
<li value=4><span class="f_NumberedList">Select the </span><span class="f_MenuKeyField">Properties</span><span class="f_NumberedList"> menu option. The </span><span class="f_UIControl">Constraint</span><span class="f_NumberedList"> dialog displays.</span><br>
<span class="f_NumberedList">&nbsp;</span><br>
<img src="activity%20-%20actioncondition2.png" width="381" height="195" border="0" alt="Activity - ActionCondition2"><br>
<span class="f_NumberedList">&nbsp;</span></li>
<li value=5><span class="f_NumberedList">In the </span><span class="f_MenuKeyField">Constraint Type</span><span class="f_NumberedList"> field, click on the drop-down arrow and select the required constraint type.</span></li>
<li value=6><span class="f_NumberedList">In the </span><span class="f_MenuKeyField">Constraint</span><span class="f_NumberedList"> field, type the text for the constraint.</span></li>
<li value=7><span class="f_NumberedList">Click on the </span><span class="f_MenuKeyField">OK</span><span class="f_NumberedList"> button</span><span class="f_NumberedList"> </span><span class="f_NumberedList">to save the constraint.</span></li>
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